The drama tells the
story of Gil Ra Im , a poor and humble stuntwoman whose beauty and body are the
object of envy amongst top actresses, and Kim Joo Won, an arrogant and
eccentric CEO who maintains the image of seeming perfection. Their accidental
meeting, when Joo Won mistakes Ra Im for actress Park Chae Rin, marks the
beginning of a tense, bickering relationship, through which Joo Won tries to
hide a growing attraction to Ra Im that both confuses and disturbs him. To
complicate matters further, a strange sequence of events results in them
swapping bodies.

Yoo Eun Jae (Lee
Si-young) is tomboyish woman and former judo athlete who is fan of baseball
league, Blue Seagulls. On her father's birthday at a karaoke bar, Eun-jae meets
the arrogant baseball player named Park Moo Yul (Lee
Dong-wook) of rival baseball team, Red Dreamers. The encounter culminates
in an argument between Eun-jae and Moo-yul being caught on camera. Next day,
Moo-yul receives anti-fans messages and Eun-jae is forced to become his
bodyguard. The seires focus relationship between Eun-jae and Moo-hyul on bricks
and apprentice of Moo-hyul's ex girlfriend Kang Jong Hee (Jessica
Jung)

Set in a period where society does not
allow females to be educated nor employed, Kim Yoon Hee (Park
Min Young) disguises herself as her brother, Kim Yoon Shik, in order to
make ends meet for her family. She goes through a series of odd jobs, mainly at
a local bookstore, before she gets offered a chance to increase her earnings by
becoming a substitute test-taker (an illegal act) for the upcoming entrance
examination in the prestigious Sungkyunkwan.
She gets caught by the upright Lee Sun Joon (Park
Yoo Chun), who later acknowledges Yoon Hee's talents, and even encourages
her to enroll in the university. There, she must bear with the endless mischief
of upperclassman Gu Yong Ha (Song
Joong-Ki), put up with the constant mood swings of roommate, Moon Jae Shin
(Yoo Ah In),
avoid getting in trouble with the strict, student body president, Ha In Soo (Jun Tae Soo), keep her secret
from being discovered, all the while trying to maintain her growing affections
for Lee Sun Joon, at bay.

Together, the four form the
"Jalgeum Quartet" (sometimes affectionately also named by fans of the
series the "Joseon F4").

The life of Go Eun
Chan (Yoon
Eun Hye) is not easy; she works many jobs to pay off debts and even gave up
her feminine image. Choi Han Kyul (Gong Yoo) is the heir of a big food company, but his
grandmother wants him to settle down, so she arranged many dates for him. After
Eun Chan bumped into Han Kyul and was mistaken for a boy, Han Kyul decided to
hire Eun Chan to be his gay lover in order to avoid the arranged dates.
Desperately in need of money, Eun Chan had no choice but to accept. Han Kyul's
grandmother also made Han Kyul in charge of a filthy coffee shop in danger of
being bankrupt. Eun Chan begged to work at the coffee shop, and not long after,
feelings start to spark, except, how would Han Kyul accept his
"homosexuality"?

Jeon Jin Ho is a
straight guy who pretends to be gay in order to become Park Kae In's roommate.
His hobbies include organization and ironing, and he’s known for his stoic
poker face. He’s a stickler for cleanliness, but he also has a talent for
figuring out a women’s feelings. Kae In is very trusting even though she has a
habit of being betrayed. However that doesn't stop her from giving people the
benefit of doubt and Jin Ho is no different. How will Kae In react when she
finds out that her gay roommate is not actually gay at all and that he has
fallen for her?

The story takes place
in Seoul, 2011. Lee Yoon Sung is a talented MIT-graduate who works on the international
communications team in the Blue House. He plans revenge on five politicians who
caused his father's death with his surrogate father Lee Jin Pyo and eventually
becomes a "City Hunter.

When Crown Prince Lee Gak is
transported 300 years into the future to present day Seoul along with his three
retainers, they believe that it is their duty to solve the murder case of the
Crown Princess in order to return to Joseon.

They land in the rooftop apartment of
Park Ha, a cheerful woman in her mid-20s, who eventually believes the odd
quartet's predicament and becomes their guardian. As Park Ha educates the four
on life in the 21st century, Lee Gak comes across Hong Se Na, who seems to be
the reincarnation of his wife. Taking on the identity of Yong Tae Yong, Lee Gak
slowly begins to unravel the murder of Yong Tae Yong and in turn moves closer
to solving the murder case of the Crown Princess. As he finds himself in love
with Park Ha, he figures that maybe the Crown Princess was not so perfect after
all..

Shin Hwa School is a school for rich
people, attended by Goo Jun Pyo, the heir of the global corporation Shin Hwa
Group, Yoon Ji Hoo, So Ee Jung, and Song Woo Bin which form a gang called F4.
Jun Pyo, the leader of F4, is the main ruffian.

Geum Jan Di, who is not from rich
family, ends up attending Shin Hwa School when she saves a boy from jumping off
the rooftop and is given a scholarship to quiet down all the publicity the
incident has caused. The entire school worships the F4 except for Jan Di.
However, she holds a certain soft spot for Yoon Ji Hoo, who appears to be
different from the other three. Jan Di finally speaks up against F4 to defend
her friend. From then on, she becomes Jun Pyo's main rival. Almost every time
Jan Di is bullied, she is helped by Ji Hoo in some way. Jan Di and Jun Pyo's
rivalry intensifies, but at the same time it is a source of amusement for him
as Jan Di has now caught his attention.

The story develops and Jun Pyo slowly starts
falling for Jan Di. On the other hand, Jan Di's attention is on Ji Hoo, her
savior, but ultimately, as the story progresses, her heart is with Jun Pyo. The
couple faces many obstacles as they continue to struggle for their love